A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5920-00-886-7896
NSN 5990-01-199-2846
NSN 5998-00-177-0796
NSN 2925-01-105-7850
NSN 6650-01-535-8726
NSN 6135-01-164-3561
NSN 5895-00-153-2595
NSN 5835-01-388-5198
NSN 5910-00-147-4754
NSN 5996-01-226-7707
NSN 6145-00-583-3940
NSN 5835-01-351-3425